[INFO] fetching crate mcai_models 0.0.1...
[INFO] testing mcai_models-0.0.1 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate mcai_models 0.0.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate mcai_models 0.0.1 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mcai_models 0.0.1
[INFO] finished tweaking crates.io crate mcai_models 0.0.1
[INFO] tweaked toml for crates.io crate mcai_models 0.0.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate mcai_models 0.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded schemars_derive v0.8.0
[INFO] [stderr]   Downloaded aho-corasick v0.7.14
[INFO] [stderr]   Downloaded regex-syntax v0.6.20
[INFO] [stderr]   Downloaded regex v1.4.1
[INFO] [stderr]   Downloaded dyn-clone v1.0.3
[INFO] [stderr]   Downloaded schemars v0.8.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6aa42ec70ef9c2dee6480e13cf0892ffbfa3d91d9ffbccf564b7198a20b9fa0b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6aa42ec70ef9c2dee6480e13cf0892ffbfa3d91d9ffbccf564b7198a20b9fa0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6aa42ec70ef9c2dee6480e13cf0892ffbfa3d91d9ffbccf564b7198a20b9fa0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6aa42ec70ef9c2dee6480e13cf0892ffbfa3d91d9ffbccf564b7198a20b9fa0b", kill_on_drop: false }`
[INFO] [stdout] 6aa42ec70ef9c2dee6480e13cf0892ffbfa3d91d9ffbccf564b7198a20b9fa0b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] aa50a00f310ef265e7b7e8b0b622692e1ca28e99d96150704d03e63eb04e6cce
[INFO] running `Command { std: "docker" "start" "-a" "aa50a00f310ef265e7b7e8b0b622692e1ca28e99d96150704d03e63eb04e6cce", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling schemars v0.8.0
[INFO] [stderr]    Compiling dyn-clone v1.0.3
[INFO] [stderr]    Compiling aho-corasick v0.7.14
[INFO] [stderr]    Compiling regex v1.4.1
[INFO] [stderr]    Compiling serde_derive_internals v0.25.0
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling schemars_derive v0.8.0
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling mcai_models v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/bin/mcai-model.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(result_flattening)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mcai_models` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "aa50a00f310ef265e7b7e8b0b622692e1ca28e99d96150704d03e63eb04e6cce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa50a00f310ef265e7b7e8b0b622692e1ca28e99d96150704d03e63eb04e6cce", kill_on_drop: false }`
[INFO] [stdout] aa50a00f310ef265e7b7e8b0b622692e1ca28e99d96150704d03e63eb04e6cce